BenchMate Vibration-Free Platforms enhance the performance of precision tabletop equipment. The 2210 Series is a Passive-Air design requiring an optional hand pump if an air source is not available. It requires periodic manual leveling. The 2212 Series is an Active-Air design that requires an air source for use (not included). It is a self-leveling unit and recommended for regular use. Applications include: (Partial List) Atomic Force Microscopes, Microhardness Testers, Profiometers, Balances, Audio Equipment, and other Precision Measuring and Testing Equipment.